Hi. Both my DDs saw a private tutor for most of year 5, for 45 minutes a week. He would then set them roughly 45 minutes of homework that DH and I were meant to check through with them. In the two months before the exam he increased their homework to include sitting quite a few 11+ past papers under timed conditions.
By the time they came to sit the actual exams they were very confident and completely comfortable with the format. They are both very happy at their school and really enjoying the experience 